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Prokaryotic Cells: Cell Envelope
Concepts tested here
- Gram staining and cell wall
All Questions
2001 AIPMT 1 question
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Difference in gram positive and gram negative bacteria is due to -Gram staining (Christian Gram) divides bacteria into two groups based on the structure of their cell wall.
Gram positive bacteria have a thick peptidoglycan layer that retains the crystal violet stain and appears purple.
Gram negative bacteria have a thin peptidoglycan layer and an outer lipid membrane; the stain is washed out by alcohol and they take up the counterstain (pink).
So the difference is due to the cell wall.